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Biological Macromolecular Structures Enabling Breakthroughs in Research and Education

Chemical Component search

The Chemical Component search page provides an easy way search the Chemical Component Dictionary
which gives detailed chemical descriptions of all residue and small molecule components found in PDB entries including standard and modified amino acids/nucleotides, small molecule
ligands and solvent molecules.

Chemical Components which are identified by three-letter codes in PDB files represent small molecules that can be:

Non-polymeric chemical components (often called free ligands) like carbohydrates, ions, solvents, etc. and which are not part of any polymer

Search Options

The page offers 3 different tabs with search capabilities of increasing complexity which are just an easy shortcut
to build advanced searches for chemical components with the option of
providing "Ligand" results.
This means that all the "advanced search" functionality like refining and modifying the search, is accessible from the results page.

Name search, based on some text that is contained, equals exactly, or sounds like, the name or one of the synonyms of the chemical component.

Formula/Weight

This tab offers a chemical formula or a formula expression search (guided by the formula expression editor),
a molecular weight range search, or a combination of both two options
in order to look for molecules of a particular size or chemical composition.